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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e24fc5e4e865091bb5ae1d0d767903b6d5c1ea3c171be06b9c942a6efd5d92a' 
  AND token = 'TtrNs7MzX1xrIlS/J7B71h3t6bcQyanMbMu5G7oOt5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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