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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9503bfc49fbf91a201513f9bf42cbd0a33128625283f980a8ef3b446a0ffbba8' 
  AND token = 'yqj/qlFvo1qmslsi1SOtS9AY1ENCV2Fo3/Tb3J6d9wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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