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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7776ab90923393ee0fb661434e38481176737a5384b69ecc18cf92a91aa5c7d1' 
  AND token = 'DK0KiPx8vj1UiSxvUEIAfumTgYxrFxxIf/MVsbcddaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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