SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ac95049899b2f6607b957aa3b8234d9ad528454056deb07e61fd6f30963d1a' 
  AND token = '93Y6TVz1krQQIy31bJzEAJsgqJsepugmjI/SH1G/VZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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