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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692fd59681e9fb164fca9e7c2de4d0e80e454bf6f7f0bb40cf8a23f7694b74e2' 
  AND token = 'nMVNvtJtqONKxQJ0L5Ze9HufpEu+v2PLRXQtTrzvQ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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