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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04371746e212e1122cbaf6dd14cc582d9bd7c779f76ad7701c3ffe3f41420a0b' 
  AND token = 'gn5DywmR3PrS9gXjt9f9ilDiCAf0GP1LnIf9CApncfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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