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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d303992e682da4c4f37ae3efb92604c3355b3184a53eed25b160374fcf2f718' 
  AND token = 'PcIdvJ1QIRL3V0MMvL4idJwzz9YU8LQCeJ9xWn4uro4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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