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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cce9017ca01fcdaf4cb839ee0ca95674c522cbbffe07ead6a57fde09c4fb2e' 
  AND token = 'tylprsrrD+UKbxZzbplT3DLLIdZPL2kcXuv8xU7l3to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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