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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df64cc5d9897b438e313752cebfb0570fa13df2e54b99ace2ad55f97f3cf4dd6' 
  AND token = 'eQL2oOyhG0TJucWQ0gcq+F/3sENJ3UWEEg3DcFoKQEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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