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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c662678d884397570c9f2a00c2dcab94bc0922b510a6d2d2bc564418dbe0c7' 
  AND token = 'EFM4T41g56qNF2afJueDvGpxpJe2kPmwU0YtsDUDeaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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