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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79af1b743117f74a0b8d85deeef3641bd01a471518c5d5e574941f14b27119b3' 
  AND token = 'pWnmvfuWCw9sgALH4Y94yZ9SjAua7S+3pYLQGATow+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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