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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514677aa7fe9846a8b1aab754de0e3e6c74b75fa021bfca2845d5a34a0aedcbb' 
  AND token = 'pgIpx7caYpn6662PlrrCt6Ik3KcCmDNprBvnKPZyBFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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