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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6392ab20cc5ec09f3b20395a7d87cdacae67a24b53dcb3a7753824de86aa02f' 
  AND token = 'qbnKX5X5C692c+aZzTVQoP2XlKHedLHKrSpL4hFHhn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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