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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88cdc69b6580cd30655d3a406db75ffdc103919732bbcf9792873154b13578d' 
  AND token = 'I75DuVnAAT2H4qv4k2tyOkzJmK9vDru3LC39bU2OWv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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