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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7c102bb5a14d07cc2b48c9a393fbc7467c7a0d3ccd2d4a97ec54c8f9e65ac8' 
  AND token = 'kiJkvilh7D3QviPQziiNPeE8kLo7rq38EejXMJpZkPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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