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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2aedcdc8df317722dafd61309b50e3a2383184be6a8b908d8fc0da5e23268d' 
  AND token = '9jOgjlEf1EN8mVc6LLJXoIntlHlgP6/9A8+WV67QVPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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