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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41df40c66b11ef096fad28c12ccdd53a0e8146a454583e1c4ad3a2ccfe5fe508' 
  AND token = 'lroSoaq5Stz3ilUR9hytyw6sx62Bzd9+u6gAqyViaz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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