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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727ecb0a15db1a06a945f8b2c5f38286b98692d430773c771b846305c1211d79' 
  AND token = 'fUrdbTVkbJJ2aYWBb9oU2HkXiT5B7X0ET1cKT7hiD44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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