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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f3e644b31fe0583c034a4aeb60c7231ca1ce0e70d5ec10be8b6ebf0393ed14' 
  AND token = '5936/e767NsRQRJzwflLcZhrdmHG8UJO8PowBWoSnYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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