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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a46e0736969fa216afe04f5a3c3896eb63fca2c5b9f5aa5a9d18a98abed272c' 
  AND token = 'W2Dux7zmHPHab2/3ntJ6tjLQbVIzRiJACwHDc2XVUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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