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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6aad98d86124ac9e43927aa87953b75d8b3caf2c12538dc76b11f50b3c5912c' 
  AND token = '456CC+dELhBm23sw9S2UR05dPWC2Z61ww1yOjC9FdtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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