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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f9596c2bf658941be5f18b4094aac09aa206089f41d92bcbd314c5da23baa0' 
  AND token = '0tohNPlqarnF3qiTB0NnAZ1W4j7cX3dIv5AOxoiFO0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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