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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b9049a876aa8919800ef999f3e6768be026801f7fd33178547e8a966cd7eb2' 
  AND token = 'v4xXi9KeKEPAHGKlfEM8SXJK9xj0llLYftu/Dwj5dSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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