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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c88fc184e6bbbb825425283c41ce2803e138a043959f8d6489635ba58ba889d' 
  AND token = 'GyYJCxkhkV71cTvUSv1f7cQNUj17UGbZbwc/Y5ce280=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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