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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9a3b6d6cdc2e39d424e9b7438f5c71f9b8fb4b9a0de2921ea42d4bc991f4a6' 
  AND token = 'HuU/tGvMgVRS/qU7/kOvIGqdjPn8nVYINvS3A2kY0sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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