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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f97ef25241ef307eb2ea9988e82eb5ff2aed7e6e56f56bc9f6e8a86b9d7fec' 
  AND token = 'Bk+z9e/tZ31aGFq8PZjLcJt6mnflcLlTiB22HipbKwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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