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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530f311fc8ec03b7e5867ad4722767cb85ef26567918510ae0429e2fae3e2230' 
  AND token = 'nCYTInx6y0VUUsLM4pRfUKHD/ZQIPc70cBkI4MxtsIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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