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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbf6698eccc3de86bb646c7501c08d1d6b5dc2561412aef13bb85003e7a63fc' 
  AND token = '4aSuApG4HrnG60Cci+Ghet2tZGQpHWCRa5i/g9eAOeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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