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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca98de43be5eefe48ba374374ce7cc9ad44b062add9fd33e86166757f76d15d' 
  AND token = '4OtdF1Zf06HpRxGC9eQX7Zz3eO8hAphMw0/DxV+fAQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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