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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d02079c6eeff160a69d1155ca3917176e6060f665921b530761e952e1261f69' 
  AND token = '/wEnyq08VYzB+Tpr13QiY6NI250ddFDRFsM0OxRDuh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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