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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc281f148a796ee9985985063d665dc78d21e0190cbaf9a753cc14b1658c0b80' 
  AND token = '/vnnckorOsftDBfax3vETc7x3VSq09nJ7iV3Oa8l01w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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