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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dc6b62e8addec8a3e57a3e6b978dec9ca9c13aec652d7cf74e8b5f73e8e052' 
  AND token = 'xsDo0JZJi0KiPjYgWm5lo2LIOsOluwd+JFf0ieCL6XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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