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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36d93b954c6f277afa8ab1344f7d4c3a15f9ceb2d6ea9bb586cf96971308e0a' 
  AND token = '7UflLx9zkrwSRwQoh1e2eMfi5row0GKrv461BBvBg8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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