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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6cd10b72b649e157c976ffe745c161bc3c911b1deb17ba913bba0a9aed19fd' 
  AND token = '4n2zrm8U1CxF8BQt3xiL6i1rAfXA2HzBlqypFGR8Z/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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