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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf32c5db96170b748b8561daca3b006cf8425715bad7e46ea598ca13dcf64a8b' 
  AND token = '3UHeeinbheE7BRRYiMJv8AnOOf24u7/ygUpMgxxV3/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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