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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5f63e8e547e6dfb016565b2bce4f1466370933e8e2af20cc475ffc15e9dfd5' 
  AND token = '9zkiM+vlf4erTtQt7y/mP0pVVuxHPQ6hTnjcBMIsHqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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