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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db0f787e7ad588a3aa45cba7513a3ed84a24ad9115aa8f0179c0d2029a44464' 
  AND token = 'VPcYYrTYI+dhQDha3RSnZjaXuR7aapwxN0PqFwsl7GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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