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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f4d5b345b84c26510df62f74a109eb1b80c3613493f89aace3564675c3b07d' 
  AND token = 'l3oa4f+E3M89SpLPwNbndkv1oFz8hEHjvW14pmjKyT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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