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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8b794de792423a06e55aaaa54a65c2368f847bd0aad6ed804900fcd4cc5984' 
  AND token = 'cdW1jb/xAnOrAeV703XoV6xLIgRV7VvOq3Ygk2uqcR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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