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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1c1fa15cbe98c76f90ba2fa6e3a1a36aeed54a49bc7d12d5b8df299368d9b1' 
  AND token = 'VQ0NEXEywsksj0y8uUrscnvPSDvL7IUhx+yeexlYBKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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