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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507aad36e231cc2ac02ccccb252a28894b97e5570b3598dc72cf4689ea721b45' 
  AND token = 'Mn8UJHZb4pYoZoO6c/e5t2WdpIcZEhuMuN2fmWhfY7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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