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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450e36360d929a3f80ee7a6864ef488e2b4cfe26f8effb8101986be27db7f300' 
  AND token = 'nqKgEJF2gRlVKW1yRDaNHaP1PKA07+vzSCSL+7St+/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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