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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc547c90c101614598beda143d68c33f1c9ee40fd182820ff51acfd313c5de65' 
  AND token = 'c8PQRm+fTia04AWYey5LhRmQ+LCOVMdlG5D3Bpjptrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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