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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b33bae1248ff05008f55c288db12687980cc7a256ac1d68901eca1968135d1d' 
  AND token = 'LF/Emt66Tiu3VDrkPJtkkBe4WupxlvjcDleLaKiedEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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