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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59191a2b1d2d8d1ae7c1e86f71cabcd24367c199da92a4c3ba8ef39c6b2c3e55' 
  AND token = 'sBjThZ9fBj5Gvur7s/c5RmPq0Mo4Be2eY/eSgdw7tyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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