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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f36f4ff5e49ce393c9bb8321b7db0ae00c0caa8a7b5d51a9a73c1087a5185a7' 
  AND token = '7IpN1q7JvMR4rLA+Vf3B9x7CpnL+/5b+q2ZBn20LB+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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