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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdad010ba2f4c38e27cd0c31badec10ad5f1cec1f0492ba02b261b3d598b3c12' 
  AND token = 'hyM/B9uhXQjEczxEzHZge+5d5f3HeCZQ38C0ugmy/h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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