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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596b54093c7c5cba2f2a9475b635b05fd262ca339b48a098c7590539195e325b' 
  AND token = 'b46MKBMEZYRBkekC5Il85/Rb5TQ29QrSvVYavlUJ2xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}