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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfc090d65b196a2aa5ffc3a4ba177aff2403883d707a470422b8741a7d64a8f' 
  AND token = 'i+JFszH31lIrP5xUCHe/KP1Lg8Ue/oTBwrI5LBrd7Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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