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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747836499e9977294b3946ac608c62fb1797d8c50df825b8a7b800e559741ee3' 
  AND token = 'Sxv5YVi1DEj5/jSK/I6Ydf2WCLYpFXA3i4FEA1OLP24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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