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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94afb6cbf9db2114f8b30520764e6c88c9af12ea618bb38e2953911627ca53bb' 
  AND token = 'Q2/DazVCuSCKLJcnQRVvY0FyASAVx71Bua1uR3jNoW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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