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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf8bbd52c82742691d347fb72a3d9d109f03128f69be66e5a00ca2ac0bcf19e' 
  AND token = 'XKFn7jwWgGLsg8R1dTJ2Ul15Bl5pHPuKlHbM2rcynZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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