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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08eb9561e36d37bac4ed06aef43010ca3e9b493e3b86f43237a60e1f57484368' 
  AND token = 'KCJ/SkD4inlxvoh4t5QtcMNDnr8XNzSmqjcuck4SJyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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