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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f085f897270a66e96da786fb77fc1e710d7e70cd42a0837c61f3671bf9c79b' 
  AND token = '1TBLxf5LkP/og5fWFPIO8hvn8oHcEzVDSVkrgVGVxIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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