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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3b5c0e9d91e72a1d63aaa6fe1082112136fe808cee3c16201e047f59a4805a' 
  AND token = 'QB2qEcZ0j/+P5VyBPW34EBY33OVgpcYdutFyR7aoW9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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