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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4069ada5f61a6b6d939a220385e5341706c4b6bdd0303f4651c7b50e1994c7' 
  AND token = '0kTGABL0K+55YVS2dVCsfJZDg+Yt4Bc1Vr0XbrWUuc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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