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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5680343d76e807c7ffca2b936b20f382c6b14cb484eda7392f6a299bc9746f' 
  AND token = 'IU4BF85CdkUbXQBNS/Br8N/6jQizmrnLX0HgrffpfbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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